Finding the Third Proportional to 212,820 and 354,700.50

Step by Step Solution

1. Step 1: Write the proportion equation
   212,820 : 354,700.50 = 354,700.50 : x
2. Step 2: Convert to fraction form
   212,820/354,700.50 = 354,700.50/x
3. Step 3: Cross multiply
   212,820x = 354,700.50 × 354,700.50
4. Step 4: Simplify right side
   212,820x = 125,812,444,700.25
5. Step 5: Solve for x
   x = 125,812,444,700.25/212,820
6. Step 6: Final answer
   x = 591,168.33